/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.google.code.twiddling.core.io;

import java.io.InputStream;
import java.io.PrintWriter;

/**
 * 
 * @author <a href="mailto:jeff.yuchang@gmail.com">Jeff Yu</a>
 *
 */
public class SystemIO implements IO{
	
	protected InputStream inputStream;
	
	protected PrintWriter out;
	
	protected PrintWriter err;
	
	public SystemIO() {
		this(System.in, new PrintWriter(System.out), new PrintWriter(System.err));
	}
	
	public SystemIO(InputStream is, PrintWriter pout, PrintWriter perr) {
		this.inputStream = is;
		this.out = pout;
		this.err = perr;
	}

	public InputStream getInputStream() {
		return inputStream;
	}

	public PrintWriter getOut() {
		return out;
	}

	public PrintWriter getErr() {
		return err;
	}

    public InputStream redirectIn(InputStream in) {
        InputStream temp = this.inputStream;
        this.inputStream = in;
        return temp;
    }

    public PrintWriter redirectOut(PrintWriter out) {
        PrintWriter temp = this.out;
        this.out = out;
        return temp;
    }

    public PrintWriter redirectErr(PrintWriter err) {
        PrintWriter temp = this.err;
        this.err = err;
        return temp;
    }
}
